.then cannot populate array javascript

Question

I have problem with this function, it returns a console log, but does not push the data to the array, how can I fix this, I know the problem is related to promises but I don't know how I can fix it.

// Parse XLSX DATA function
function parseXLSXData(myFile) {
  // Using the Read XLSX file cdn JS
  let parseData = [];

  readXlsxFile(myFile).then((rows) => {
    // `rows` is an array of rows
    // each row being an array of cells.
    console.log(rows);
    parseData.push(rows);
  });
  
  return parseData;
}